package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增分类
     * @param categoryDTO
     */
    @Override
    public void save(CategoryDTO categoryDTO) {
        Category category=new Category();
        //属性拷贝
        BeanUtils.copyProperties(categoryDTO,category);
        //分类状态默认为禁用状态
        category.setStatus(StatusConstant.DISABLE);

        //设置创建时间、更新时间、创建人、修改人
            //获取当前系统时间
        //category.setCreateTime(LocalDateTime.now());
        //category.setUpdateTime(LocalDateTime.now());
            //通过ThreadLocal
        //category.setCreateUser(BaseContext.getCurrentId());
        //category.setUpdateUser(BaseContext.getCurrentId());
        categoryMapper.insert(category);
    }


    /**
     * 分类分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        //在此利用mybatis给我们提供的一个分页插件 pagehelper-spring-boot-starter
        //开始分页查询
        PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());
        //调用mapper的持久层查询  此处因为使用了PageHelper所以接收的形参是固定的  用Page接
        Page<Category> page=categoryMapper.pageQuery(categoryPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }


    /**
     * 编辑分类
     * @param categoryDTO
     */
    @Override
    public void update(CategoryDTO categoryDTO) {
        Category category=new Category();
        //对象属性拷贝
        BeanUtils.copyProperties(categoryDTO,category);
        //填入更新时间
        //category.setUpdateTime(LocalDateTime.now());
        //填入修改人id   利用ThreadLocal
        //category.setUpdateUser(BaseContext.getCurrentId());
        //调用持久层mapper
        categoryMapper.update(category);
    }

    /**
     * 启用禁用分类
     * @param status
     * @param id
     */
    @Override
    public void startORstop(Integer status, Long id) {
        //将我们的参数封装为一个category对象
        Category category = Category.builder()
                .status(status)
                .id(id)
                //.updateTime(LocalDateTime.now())
                //.updateUser(BaseContext.getCurrentId())
                .build();
        //调用持久层mapper连接数据库
        categoryMapper.update(category);
    }

    /**
     * 根据id删除分类
     * @param id
     */
    @Override
    public void delete(Long id) {
        //删除需保证菜品分类下面没有菜品
        Integer count=dishMapper.countByCategoryId(id);
        if(count>0){
            //当前菜品分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }
        //删除需保证套餐分类下面没有套餐
        count=setmealMapper.countByCategoryId(id);
        if (count>0){
            //当前套餐分类下有套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }
        categoryMapper.delete(id);
    }



    /**
     * 根据类型查询分类
     * @param type
     * @return
     */
    public List<Category> list(Integer type) {
        return categoryMapper.list(type);
    }
}
